marcandre	2015-01-30 00:56:58 +0900 (Fri, 30 Jan 2015)

  New Revision: 49441

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=49441

  Log:
    * string.c: [DOC] Specify to_s on subclasses [ci skip]

  Modified files:
    trunk/string.c
Index: string.c
===================================================================
--- string.c	(revision 49440)
+++ string.c	(revision 49441)
@@ -4877,7 +4877,9 @@ rb_str_to_f(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L4877
  *     str.to_s     -> str
  *     str.to_str   -> str
  *
- *  Returns the receiver.
+ *  Returns +self+.
+ *
+ *  If called on a subclass of String, converts the receiver to a String object.
  */
 
 static VALUE

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